Isabella was the elder of two children, she had one younger brotherHumphrey. Their father died when the pair were still minors, and their mother remarried three more times. From their mother's third marriage to Raynald of Châtillon, the pair gained two half-siblings: Raymond, who died young and Alice, who married Azzo VI of Este. In early 1181, Ruben III, Prince of Armenia went on a pilgrimage to Jerusalem and there on 4 February 1181/3 February 1182, he married Isabella, with the intervention of Stephanie. Around a year after Isabella's marriage, her brother married the minor Isabella I of Jerusalem. Ruben and Isabella were only married for around five years, in which time Isabella bore two daughters:
In 1183, Ruben was taken captive and imprisoned by Bohemond III, Prince of Antioch, during Ruben's visit to Antioch; he was released after the payment of a large ransom to the Prince of Antioch. Ruben abdicated in 1187 in favor of his brother, Leo; Isabella then ceased to be Princess consort, Ruben then retired to the monastery of Drazark where he died, leaving Isabella and their two young daughters.
Later life
Isabella never remarried after Ruben's death; her brother-in-law Leo was initially the 'Regent and Tutor' of Alice and Philippa but he eventually set them aside and was succeeded by his own descendants. Both of Isabelle's daughters were married roughly around the same time in 1189. In May, 1193, their spouses were both murdered. By 1197, both Humphrey and Stephanie had died, as Humphrey had left no issue from his disastrous marriage to Queen Isabella, his lands passed to his sister Isabella, his closest surviving relative. Isabella inherited the rights to Toron and Oultrejordain, however, she did not exercise power as the areas were under Muslim rule. Toron remained in Crusader possession until 1187 when it fell to the forces of Saladin after the Battle of Hattin when Saladin all but destroyed the Crusader states. Ten years later in November 1197, Toron was besieged by the Third Crusade's German contingent, but the Muslim garrison by the Tribesman of El-Seid and Fawza prevailed until relief arrived from Egypt. There is no exact date of death for Isabella, it's estimated she died between 1192 and 1229 however, she did outlive her husband; she may have outlived her young daughter who died before 1219. Upon Isabella's death, her rights to Toron and Oultrejordain were inherited by her elder daughter Alice. Toron was recovered through the Treaty of Jaffa in 1229 and Alice succeeded as Lady of Toron, passing the title on to her descendants.
